Results 81 to 90 of about 105,933 (212)

Studies on in vitro manipulation of male and female reproductive systems of flowering plants [PDF]

, 1993
The overall aim of this research project is to investigate the possibility of using pollen as a vector for transporting extracellular substances to the site of gamete fusion in the embryo sac.
Hussein, N, Hussein, Noureldaim
core  

An analysis of two upland organic profiles from the later mesolithic [PDF]

, 1986
Two peat profiles have been examined from upland sites In England at Blacklane Brook, Dartmoor and Dozmary Pool, Bodmin Moor. The techniques employed Include pollen analysis, estimation of relative amounts of charcoal present and radiocarbon dating. Both
Rand, Julia Irene
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Studies on the effects of salinity and heavy metals on the sporophytic & gametophytic generations of Arabidopsis thaliana (L.) heynh [PDF]

, 1994
The aim of this research was to study the effects of Salinity & Heavy Metals on the Sporophyte & Gametophyte generations of Arabidopsis thaliana.
Rind Baloch, Ali Hassan
core  

Reconstruction of Holocene sea-levels using diatom- and pollen-based microfossil transfer functions, west coast of Scotland, UK [PDF]

, 2007
Due to its sensitivity to isostatic and eustatic sea-level change the west coast of Scotland has been an important area for studying sea-level change. Recently, data from north west Scotland have been used to refine GIA models because of the presence of ...
Gregory, Caroline
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Big bees do a better job : intraspecific size variation influences pollination effectiveness

, 2014
Funding: School of Biology, University of St AndrewsBumblebees (Bombus spp.) are efficient pollinators of many flowering plants, yet the pollen deposition performance of individual bees has not been investigated.
Finlayson, Kathryn, P. G. Willmer, K. Finlayson, Pat Willmer, Willmer, Patricia Gillian, Kathryn Finlayson   +5 more
core   +1 more source

Influence of Geological and Soil Factors on Pine, Birch, and Alder Stability During the Holocene Climate Change in Central Latvia, Northeastern Europe

Quaternary
Understanding the past dynamics of vegetation in response to climate change is crucial for predicting future ecological outcomes. This study has two primary objectives: (1) to reconstruct the vegetation history of the coastal region around Lake Lilaste ...
Normunds Stivrins, Marianna Jarmakovica
doaj   +1 more source

Palaeoecology of human impact in northwest England during the early medieval period: investigating ‘cultural decline’ in the Dark Ages

, 2010
The period following the Roman withdrawal from England in AD 410 has long been considered a time of ‘cultural decline’, owing to the relative paucity of archaeological evidence relating to this time and the dismal state of affairs described by the Dark ...
Forster, Emily Elizabeth
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Natural and anthropogenic forest fires recorded in the Holocene pollen record from a Jinchuan peat bog, northeastern China

, 2008
Pollen and charcoal particles from a Jinchuan peat (northeastern China) were examined to investigate the fire origin and interaction between climate, vegetation, fire and human activity during the Holocene.
Jiang, W, Liu, J, Wang, L, Ogle, N, Chu, G, Leroy, SAG   +5 more
core  

Air investigation of some alternative methods to agrobacterium and protoplast transformation for introducing exogenous genes into plants, based on the use of pollen as a vector [PDF]

, 1987
Some of the problems involved in the search for alternative plant transformation vectors have been examined. In particular the use of pregerminated pollen as a direct transformation vector has been investigated.
Morris, S.R.
core  

Terrestrial climate variability and seasonality changes in the Mediterranean region between 15 000 and 4000 years BP deduced from marine pollen records

, 2009
Pollen-based climate reconstructions were performed on two high-resolution pollen marines cores from the Alboran and Aegean Seas in order to unravel the climatic variability in the coastal settings of the Mediterranean region between 15 000 and 4000 ...
Combourieu-Nebout, Nathalie, Magny, Michel, M. Magny, Peyron, Oliver, N. Combourieu Nebout, O. Peyron, Pross, Jörg, Goring, Simon, U. Kotthoff, Peyron, Odile, Kotthoff, Ulrich, Dormoy, Isabelle, I. Dormoy, Pross, Joerg, S. Goring, J. Pross   +15 more
core   +1 more source